Improvement in spikes



G. N. SANDERS.

. SPIRES. I N0.171,486. Patented Dec. 28,1875.

Vibiewegr: Ewe/2201'" aim N.PETERS. FHDTU-LITNOGRAPNER. WASHINGTON. DvC.

UNITED STATES GEORGE N. SANDERS,

OF NEW YORK, N. Y.

IMPROVEMENT lN SPIKES.

Specification forming part of Letters Patent No. 171,486, dated December28, 1875; application filed May 10, 1875.

CAsE E.

To all whom it may concern:

Be it known that I, GEORGE N. SANDERS, of the city of New York, State ofNew York, have invented the hereinafter-described Improved Spike, ofwhich the following is the specification Referringto the figures in theaccompanying drawing, Figure 1 is a side view, and'Fig. 2 a rear view,of the spike A.

B is a hollow or depression in the back of the spike; a b, the bevel,and b c d the concaving opposite the bevel.

Theimprovement herein consists in reducing the tail a be d. to a minimumthickness, and causing the whole of the concave surface b c d to act ina measurein resisting the extraction of the spike. The sides of thedepression B maintain the perfect rigidity of the shank, whichespecially adapts this form to uses Where it is undesirable that theshank should bend.. The amount of metal moreover is reduced to aminimum, and the point a b 0 d to the greatest possible sharpness andthinness.

The exact shape of the hollow or depression is immaterial so long as thegeneral form is preserved, and the surfaces described as curved are onlysuch by preference, as if composed of approximating planes they would beof similar though inferior effect.

The shape of the head and of the perimeter of the shank is immaterial,except that they should befitted to the uses for which the spike isintended.

The various sizes are adapted to the uses of bolts, pins, nails, andsimilar fastenings adapted to being secured by being driven into wood orother material.

I claim as my invention- The improved spike A, herein described andshown. 7

In testimony whereof I have hereunto subscribed my name in the presenceof two witnesses this 7th day of May, A. D. 1875, at the city of NewYork.

GEO. N. SANDERS. Witnesses:

E. J. E. SoHREcK, LEWIs SANDERS.

